Mysql 选择参与者最多的论坛主题

因此，我正在为我的论坛建立一个会员奖励系统，并在选择“参与者最多的论坛主题”时遇到了这个问题

我已经有了这个查询，它统计了在过去24小时内每个论坛主题有多少帖子（回复）

SELECT poster . * , count( odgovori.id_odgovor ) AS broj, members.username
FROM poster
INNER JOIN odgovori ON ( odgovori.na = poster.id_poster )
INNER JOIN members ON ( poster.od = members.id_member )
WHERE poster.datum = '01.06.09'
GROUP BY odgovori.na, odgovori.od
ORDER BY broj DESC
LIMIT 1 

表海报-论坛主题表 表odgovori-回复表 表成员-成员表，在此查询中仅用于获取主题作者的用户名

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订购时不需要说明吗？ table poster - forum topics table table odgovori - replies table table members - members table, in this query only used to get topic author's username

SELECT  poster.*, COUNT(DISTINCT odgovori.author) AS different
FROM    poster
JOIN    odgovori
ON      odgovori.na = poster.id_poster
GROUP BY
        poster.id
ORDER BY
        different DESC
LIMIT 1